Model Predictive Control for Single-Stage Grid-Tied Three-Port DC-DC-AC Converter Based on Dual Active Bridge and Interleaved Boost Topology

This paper presents a control strategy for a novel three-port DC-DC-AC converter based on dual active bridge and interleaved boost topology connected to PV, battery, and grid. We use model predictive control (MPC) framework to provide control actions in both islanded and grid-connected mode of operation. The control objectives are output voltage regulation in islanded mode when converter power flows between port-1 and port-3, maximum power point tracking (MPPT) during operation between port-1 and port-2, and active and reactive power control while operating in grid-connected mode. The different power flow modes of the converter have been represented as discrete time state-space models and then, cost functions have been developed. Convex optimization of the cost functions provides optimal control inputs and thus, the objectives are fulfilled. The simulation performed in Matlab/Simulink validates the effectiveness of the developed control method using MPC for the novel three-port converter (TPC).